Sunset frontend code for ReadySetCyber (CRASM-807, 808, 809)

[hawkishpolicy]

• Removes all frontend code related to the Ready Set Cyber Dashboard project.

🗣 Description

• Deleted ReadySetCyber directory from frontend/src/components.
• Deleted ReadySetCyber routes from frontend/src/App.tsx.
• Deleted ReadySetCyber conditional rendering from frontend/src/components/Layout.tsx.
• Removed RSC directory from docs/src/documentation-pages.
• Removed RSC related code in gatsby-config.js.
• Removed RSC cors origin from frontend/scripts/api.js.
• Removed commented out conditionals in frontend/src/components/Layout.tsx.
• Removed imports, logic, and components related to RSC in frontend/src/components/RouteGuard.tsx.
• Removed readySetCyber from userType in frontend/src/types/user.ts.
• Removed readySetCyber from userFormValues in frontend/src/types/user.ts.
• Removed readySetCyber from user levels in frontend/src/hooks/useUserLevel.ts.

💭 Motivation and context

• Removes all frontend code for the RSC Dashboard project as it is no longer apart of the CyHy Dashboard.
• Closes CRASM-807
• Closes CRASM-808
• Closes CRASM-809

🧪 Testing

• Repopulated local db with RSC data and began deleting components and logic.

✅ Pre-approval checklist

• This PR has an informative and human-readable title.
• Changes are limited to a single goal - eschew scope creep!
• All future TODOs are captured in issues, which are referenced
  in code comments.
• All relevant type-of-change labels have been added.
• I have read the CONTRIBUTING document.
• These code changes follow cisagov code standards.
• All relevant repo and/or project documentation has been updated
  to reflect the changes in this PR.
• Tests have been added and/or modified to cover the changes in this PR.
• All new and existing tests pass.

✅ Pre-merge checklist

• Revert dependencies to default branches.
• Finalize version.

✅ Post-merge checklist

• Create a release.

[jayjaybunce]

Tested functionality and visual consistency across the app. LGTM

[chrtorres]

LGTM per code review 11/15/24

[nickviola]

LGTM